典型草原地区轮休与连年刈割的比较研究

研究了锡林郭勒草原白音锡勒地区割草场群落主要种群的数量特征，结果表明：１９８４年轮休割草场群落地上生物量为２４８．５９ｇ／ｍ２，其中禾草占５２．９１％，羊草（Ｌｅｙｍｕｓｃｈｉｎｅｎｓｉｓ）占３０．１５％，连年刈割的割草场群落地上生物量为２１６．２８ｇ／ｍ２，禾草占５３．０４％，羊草占２９．７５％．１９８９年轮休割草场地上生物量为１８０．９０ｇ／ｍ２，禾草占５２．３２％，羊草占３３．０１％，连年刈割的割草场群落地上生物量为１７０．７４ｇ／ｍ２，禾草占５０．３７％，羊草占３２．１９％，群落丰富度、多样性指数１９８４年轮休的割草场为５６、２．７８１，连年刈割的割草场为４８、２．５５８．连年割草使群落结构向旱生化发展．

The Comparison Researches between Mowing in Succession Years and Rotation in the Typical Steppe Region

The quantitative characters of the community and main populations of the mowing pasture of Baiginxile stock-raising farm were studied from 1984 to 1989. The major results are as follows:the above-ground standing (community) biomass of the rotation in 1984 is 248. 59 g/m2,in which the grasses account for 52. 91% and Leymus chinensis for 30. 15 %,comparatively,the biomass of mowing in succession years is 216. 28 g/m2,in which the grasses account for 53. 04% and L.chinensis for 29. 75 %. Until 1989, the above-ground biomass of rotation is 180. 90 g/m2,the proportion of grasses is 52. 23% and that of L. chinensis is 33. 01 %. At the same time,the biomass of mowing in succession years is 170. 74 g/m2,and the proportion of grasses and L. chinensis are 50.37% and 32. 19% respectively. Furthermove,mowing can promote the community developing xerophytically. From 1984 to 1989,the above-ground biomass of the community the richness index and divisity index of the community of rotation are higher than those of the mowing in succession years in the same year. The community structure of the rotation is better than that mowing in succession years.